Abstract
We report the observation of an unexpected magnetic transition in the Kondo semimetal CeNiSn under uniaxial pressures. For $P\ensuremath{\parallel}a,$ both the specific heat C and magnetic susceptibility \ensuremath{\chi} decrease steadily with increasing P. By contrast, once $P\ensuremath{\parallel}b$ and $P\ensuremath{\parallel}c$ exceed 0.13 GPa, $C(T)$ exhibits a distinct jump at 4 K followed by a peak at 3 K. The concomitant peaking in $\ensuremath{\chi}(T)$ for $P\ensuremath{\parallel}B\ensuremath{\parallel}c$ is indicative of an antiferromagnetic transition.
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